Compare 21979 vs 21990
| Property | 21979 | 21990 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 4 |
| Total factors | 2 | 4 |
| Prime factorization | 311 × 7091 | 21 × 31 × 51 × 7331 |
| Prime factorization | 31 × 709 | 2 × 3 × 5 × 733 |
| Divisors count | 4 | 16 |
| Divisors | 1, 31, 709, 21979 | 1, 2, 3, 5, 6, 10, 15, 30, 733, 1466, 2199, 3665, 4398, 7330, 10995, 21990 |
| Number of properties | 1 | 0 |
| Semiprimes | 5549th | |
| Roman numberals | ||
| Base 2 | 1010101110110112 | 1010101111001102 |
| Base 3 | 10100110013 | 10100111103 |
| Base 4 | 111131234 | 111132124 |
| Base 5 | 12004045 | 12004305 |
| Base 6 | 2454316 | 2454506 |
| Base 7 | 1210367 | 1210537 |
| Base 8 | 527338 | 527468 |
| Base 9 | 331319 | 331439 |
| Base 10 | 2197910 | 2199010 |
| Base 11 | 1557111 | 1558111 |
| Base 12 | 1087712 | 1088612 |
| Base 13 | a00913 | a01713 |
| Base 14 | 801d14 | 802a14 |
| Base 15 | 67a415 | 67b015 |
| Base 16 | 55db16 | 55e616 |